Bump on penis shaft

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first week (red bump. popped it and a bit of blood and pus came out)

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second week (dried out)

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third week (became flat and shiny bump. is it a scar?) hey everyone. i have this one bump on my penis shaft for 3 weeks. At first, it appeared like acne/pimple and when i popped it, there was pus and blood burst from it. After 2 weeks, it dried out and became like a flat, shiny bum. Went to see a doctor and she said that it's a folicullitus. I was quite sexually active before and I'm worried of it's an STD. haven't done my STD test yet because the doctor said that it does not look like bump caused by STD. But i am still worried since it still does not go away after 3 weeks. Anyone have any clue on what it is? i thought it might be lymphocele at first since i masturbated thrice a day before it appeared. Now, it turns to a flat, shiny bump on the third week.